Calculating-machine.



G. A. MEILIGKE.

' UALUULATING MACHINE. APPLICATION FILED MAR. 4, 190a.

* 914,439. r Patented Mar. 9, 1909.

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WITNESSES G. A. MBILICKE.

CALCULATING MAUHINB. APPLICATION FILED MAR. 4, 1908 914,439, Patented Mar. 9, 1909.

3 SHEETS-SHEET 2.

INuSNTon l ifZW My G. A. MEILIGKB. CALCULATING MACHINE APPLIUATION FILED HAR41908.

Patented Mar. 9, 1909.

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'inclosing casing of the UNITED STATES PATEN T OFFICF.

CARL ARNO MEILIOKE, OF HANLEY, SASKATCHEWAN, CANADA.

CALCULATING-MACHINE To all whom itmaq concern.

Be it known that I, CARL ARNo MEiLroKE, of the town of'Hanley, in the Province of Saskatchewan, Canada, lumber merchant, have invented certain new and useful Im provements in Calculating Machines, of which the followin is the specification.

My invention re ates to calculating machines, and the object of the invention is to produce a simple mechanism which will enable charges or accounts of different kinds to be easily computed hnd which is particularly designed for computing interest upon,notes. It consists essentially in a rotatablecylim drical drum on which is a daily computed interest chart, and a. registering plate carried on acasing inclosing the drum, the late having tabulated yearly interests on do, nite amounts, the construction and combination of parts being more fully described hereinafter and definitely set forth in the claims.

Figure 1 is a side elevation of m calculating machine. Fig. 2 is'a vertica sectional view in the plane denoted b the line X X, Fig. 1. Fi 3 is an enlarge front elevation of the mac ine, part being shown in vertical longitudinal section and part being broken away as will ap ear. Fi 4 represents a portion of the ta ulated late carried by the dium, and also a ortion of the interest chart on the drum. ig. 5 is a detailed perspective of a portion of the drum showing the manner in which the chart is secured thereon.

In the drawings like characters of reference indicate corresponding parts in each figure. 1 represents an inclosing casing, the u per ortion being substantially cy in-drica in orm and disposed with its axis horizontal, said' casing being formed below into a suitable base 2, adapted to rest upon a horizontal support such as a table or desk. At a suitab e point, preferably upon the uxper side, the wall of the casing is provide with an elongated slot 3, which passes across the casing as shown. The purpose of this opening will appear more in ly iereinafter. The end ieces of the casing are formed with suita le bearings 4 and 5, and the center of the cylindrical portion of the casitig is concentric with the bearings.

6 and T are thumb heads, each formed integral with a sleeve 8, which is received in the bearings 4 and 5, respectively, and passes Specification of Letters Patent.

Application filed March A, 1908.

Patented March 9, .1909.

Serial No. 419,816.

slightly within the casing. The sleeves have both a shoulder 9 which rests against the respective bearings.

10is a longitudinal shaft or axle having its endsthreaded as at 11, and being thus edapfr o ed to screw into the threaded center of the sleeves 8.

12 is a drum of cylindrical form, ri idly fastened to the shaft by means of radial ribs or spokes l3 passin to a hub 14 which is in turn connected to t e shaft, so that turning the thumb heads enables the drum to be m tated as desired. The drum is slit longitudinally from end to end and the sides of. the slit are formed with suitable ribs 15 m which form a bearin face for a wcdr-qe shaped strip 16 which is placed therew tween. Fastened to the wedge along in: length are rods 17 which extend radially; ir.=-- wardly, and are provided with a thread d end on which operates a winged or other sunut 18.

19 is a cross brace assing between. the a he 13 and through whic the respective rods .1

ass. The nuts on these rods are on thr inner side of the braces, and consequently screwing up the nut tightens the wedge sha ed strip 16 in the drum.

pon the outer surface or periphery of fin drum I attach a chart or sheet ofmctal on which figures are arranged so that they more stitute a computin table. The sheet is divided into clroum erential and longitudt naliows as shown. As to the precise arrangemcnt of the figures I will describe this 5* shortly. The sheet could be formed of paper printed as re uir'ed and sim ly pasted or stuck on the rum, but in t 1e present. instance where a metallic sheet is used. the ends of the sheet are bent inwardly as at 20 at and 21 andinserted against the opposin faces of the ribs 15. By turning the winger nuts 18 the wedge-shaped plate 16 is drawn inwardly and binds and holds the sheet tightly against the ribs and in position on the loo drunn,

22 is a plate which has an elongated slot 23 used as a sight opening, through which may be seen the chart on the drum. The plate is suitably bolted to the casing (-overmg over the slot or opening 3 as is best shovm in Fig. 2. Above the slot 23 is a computed. interest table 24, and below is a second table 25, which has an 11 per and slower lon itudinal row 26 an 27, respectively. Tie 11C rows are both divided into seven major col- 1 tabulated plate.

columns in which the rhimbers 100,200, 300,

. to 900, are successively placed.

note is $200.00.

the end of the seventh major column, that is to the right, is written the word Days. Although I have spoken of the interests 4%, 5%, 6%, etc., and of the seven major be increased or decreased according to the requirement in any particular case.

The upper table 24 is as now described. It is divided into fiveloiigitudinal rows, and

i l l i seven major columns, corresponding to the 1 major columns of the lower table. The

major co umns are again sub-divided into Directly to the right oi nine minor columns. the table 24, and above the word Days is written successively. in rows 1 YR, "2 Yrs, "3 Yrs", 4 Yrs, and 5 Yrs. in the minor columns in each instance directly above the percentages shown on the 1 lower table are tabulated the amount of iiiterest on a sum. of 100, 200, 300, to 000, doll/ars, for 1, .2, to 5, years. The nulnbcr-of rows on this latter table could also be increased to atcommodate any number of years required, and although 1 have only shown the yearly interests for live years,

that for further years could easily be com- $07.91, which is the same as 5500.79 on $20.00,

puted and tabulated.

The chart 28 on the drum is as already suggested divided into lon itudinal rows and circumferential columns; the number of longitudinal rows being three hundred and sixtydour, and the number of each appears on. the drum through the sight opening directly in a line with the word Days" on the lower table 25. "he number of circumferential columns is exactly the same as the number of minor columns on the tabulated plate 22, and in the successive spaces longitudinally across the chart are tabulated interests on a dclinitc amount at a definite rate of interest on a dcl'initc number of days.

in order that the manner of making lzalculation may be the better understood I will now give an example, the ligures for which will be better found if reference be made to Fig. 4 where a portion of both the chart and tabulated scale are shown.

In banks and similar institutions notes are constantly being computed and l will suppose that the interest is to be computed on a note which is due or matures on December the 30th; the present date being considered as January the 3rd. The number of days to maturity is readily figured and found to be three hundred and sixty-one. The calculating machine is then used and the drum is turned till 361 a pears, through the sight opening, opposite tie word Days on the Sup ose next the interest is stated at 5%, and that the amount of the Referring new again to the calculator, on the lower table of the tabulated plate we find 5%, and a number which we use. Directly above 200 we see through the sight opening and on the drum a number 0.80", which is the interest on $200.00, for three hundred and sixty-one days at five per cent. Consw quently the amount necessary to meet the columns, it will be understood these could 1 note when it is matured would be two hundred and nine dollars and eighty-nine cents. A second example is now given to show 1 how the calculator can be utilized forirregular amounts which may fall due within a certain number of years and days. For example if it be asked what amount is necessary to meet a note for four hundred and twenty-three dollars, which matures in two years and three hundred and sixty one days, the interest being given at four er cent. To find this the drum is turned til 361 appears in the sight opening opposite the word Days and on the lower table of the tabulated plate we find "4%, and also the numbers "400, 200, and 300 and directly opposite these on the drum the amounts 15.83. 7.01, and 11.87 which are the computed interests on 400, 200, and 300, at 1 %,i"or 361 days. amount $423.00 is made up of $400.00, $20.00, and $3.00, and the interest on $400.00 is as above $15.83, on $200.00

and on $300.00 the interest is $11.87, which is the same as $0011 on $3.00. Consequently the interest on the $423.00 for 361 days would be the summation of the interest amounts found which equals 1515.83, 150.79 and $0.11 added together, or in all $10.73. In the upper table on the plate we have in the row opposite "2 Yrs, and directly above the amounts 400, 200, and 300 on the 4% column,

the amounts 32, 16, and 24 which are the computed interests on 400, 200 and 300, at 4 7 for 2 years. By changing the decimal point in the same manner as we have pre-- viously done we find that the interest on $400.00, is $32.00, on $20.00 is 551.60, and on 33.00 is $0.24, which sunimated is $33.84. Combining this with the interest already obtained, 'i. 6. $16.73, we have the interest on v the note for the time stated, that is $50.57. The amount then required to meet the note when it matures would be the original amount added to the interest, or $473.51.

The calculating machine as shown will be found ample to satisfy ordinary conditions. In banks and such like institutions where the ran 0 does not need to be so large as descri ed in the present instance I would construct a machine which would have only the prevailing percentages on it, with the correspending tabulated interests.

Although I have explained the working of T he fit)

within said casing and having thumb heads extending therefrom beyond the casing I whereb it may be rotated; it computed lI'lterest c iart having a day index, on tne drum; a plate having an ciongatelopcnmg therein secured to the casing, the opening registering 1 with the sight 0 ening in the casing, the said plate having a ower table with a series of percentages and a number of definite amounts noted thereon, and an upper table with computed interests on such amounts at the individual percentages and a year index to such interests, as and for the purpose specified.

:3. in a machine for computing interest on notes, a rotatabiy mounted drum having thereon a chart containing interest amounts arranged successively in numbered divisions corresponding to the days for which the notes may run; and a plate registering with the chart and bovin sight opening therein, there being beneath the slot a table having a number of percentages successively arranged thereon with mnonnts similarly notated successively an elongated slot forming a i above each of the percentages, and above the slot 8, table having the interest amounts, corresponding to the definite amounts at the successive rates of interest on the lower fable, notnted, sueh interest amounts being arranged successively in numbered divisions corresponding to the years for which the notes may run, as and for the pur ose specified.

:3. In a machine of the cliiss described the combination com rising a drum having a. longitudinal slit t erein; a chart adapted to j be placed on the drum and with its ends inadepted to pass within the slit, and means for tightening the wedge, as and for the purpose specified.

in a machine of the class described the combination comprising a drum having a iongitudinel slit therein, there being inwardly 1 extending ribs formed at the sides of the slits; i a chart arranged to pass around the drum 1 and having its ends passing within the slit; a 1 wedge-shaped strip adapted to enter the slit to hold the chart on the drum; and adj ustable means for tightening the wedge between the ribs, as and for the purpose specified.

CARL ARNO MEILICKE.

Witnesses:

R. Comm, B. Born.

sorted within the slit; a wedge-shaped strip 

